单项选择题
TheSafetyManagementCertificateshouldbeissuedtoashipforaperiodwhichshouldnotexceed()yearsbytheAdministrationoranorganizationrecognizedbytheAdministrationor,attherequestoftheAdministration,byanotherContractingGovernment.
A.five
B.six
C.seven
D.eight